Question: alias() in alias(), how to do it?

I want to define an alias L_2 in terms of another alias L_1, the latter being a RootOf(). I noticed that doing the following does not work: How to fix it? Should I define the two alias sequantially? That is, L_1 first and then (in a follow up alias()) L_2?

Sorry for the super complicated expressions. You could perhaps show me with a simpler example. Thanks!

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